package serialcom;

import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.Enumeration;

public abstract class DefaultSerialConnection implements SerialPortEventListener {
	SerialPort serialPort;
	/** The port we're normally going to use. */
	private static final String PORT_NAMES[] = { 
			"/dev/tty.usbserial-A9007UX1", // Mac OS X
			"/dev/ttyUSB0", // Linux
			"/dev/ttyS0", // AlaMode
			"COM3", // Windows
	};
	/**
	 * A BufferedReader which will be fed by a InputStreamReader converting the
	 * bytes into characters making the displayed results codepage independent
	 */
	private BufferedReader input;
	/** The output stream to the port */
	private OutputStream output;
	/** Milliseconds to block while waiting for port open */
	private static final int TIME_OUT = 2000;
	/** Default bits per second for COM port. */
	private static final int DATA_RATE = 9600;

	public void initialize() {
		CommPortIdentifier portId = null;
		@SuppressWarnings("rawtypes")
		Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();

		// First, Find an instance of serial port as set in PORT_NAMES.
		while (portEnum.hasMoreElements()) {
			CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
			System.out.println("RXTX Avail ports: "+ currPortId);
			for (String portName : PORT_NAMES) {
				System.out.println("RXTX Trying port: "+portName);
				if (currPortId.getName().equals(portName)) {
					System.out.println("Found port: "+portName);
					portId = currPortId;
					break;
				}
			}
		}
		if (portId == null) {
			System.out.println("Could not find COM port.");
			return;
		}

		try {
			// open serial port, and use class name for the appName.
			serialPort = (SerialPort) portId.open(this.getClass().getName(), TIME_OUT);
			// set port parameters
			serialPort.setSerialPortParams(
					DATA_RATE, 
					SerialPort.DATABITS_8,
					SerialPort.STOPBITS_1, 
					SerialPort.PARITY_NONE
			);

			// open the streams
			input = new BufferedReader(new InputStreamReader(serialPort.getInputStream()));
			output = serialPort.getOutputStream();

			// add event listeners
			serialPort.addEventListener(this);
			serialPort.notifyOnDataAvailable(true);
		} catch (Exception e) {
			System.err.println(e.toString());
		}
	}

	/**
	 * This should be called when you stop using the port. This will prevent
	 * port locking on platforms like Linux.
	 */
	public synchronized void close() {
		if (serialPort != null) {
			serialPort.removeEventListener();
			serialPort.close();
		}
	}

	public BufferedReader getInput() {
		return input;
	}

	public OutputStream getOutput() {
		return output;
	}

	//Test DefaultSerialConnection
	public static void main(String[] args) throws Exception {
		DefaultSerialConnection main = new DefaultSerialConnection(){

			/**
			 * Handle an event on the serial port. Read the data and print it.
			 */
			@Override
			public void serialEvent(SerialPortEvent oEvent) {
				if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
					try {
						String inputLine = getInput().readLine();
						System.out.println(inputLine);
					} catch (Exception e) {
						System.err.println(e.toString());
					}
				}
				// Ignore all the other eventTypes, but you should consider the other
				// ones.	
			}
			
		};
		main.initialize();
		Thread t = new Thread() {
			public void run() {
				// the following line will keep this app alive for 1000 seconds,
				// waiting for events to occur and responding to them (printing
				// incoming messages to console).
				try {
					Thread.sleep(1000000);
				} catch (InterruptedException ie) {
				}
			}
		};
		t.start();
		System.out.println("Started");
	}

}
